dom/media/VideoTrack.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 et tw=78: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/HTMLMediaElement.h"
   8 #include "mozilla/dom/VideoStreamTrack.h"
   9 #include "mozilla/dom/VideoTrack.h"
  10 #include "mozilla/dom/VideoTrackBinding.h"
  11 #include "mozilla/dom/VideoTrackList.h"
  12
  13 namespace mozilla {
  14 namespace dom {
  15
  16 VideoTrack::VideoTrack(nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
  17                        const nsAString& aKind, const nsAString& aLabel,
  18                        const nsAString& aLanguage,
  19                        VideoStreamTrack* aStreamTrack)
  20     : MediaTrack(aOwnerGlobal, aId, aKind, aLabel, aLanguage),
  21       mSelected(false),
  22       mVideoStreamTrack(aStreamTrack) {}
  23
  24 VideoTrack::~VideoTrack() = default;
  25
  26 NS_IMPL_CYCLE_COLLECTION_INHERITED(VideoTrack, MediaTrack, mVideoStreamTrack)
  27
  28 NS_IMPL_ADDREF_INHERITED(VideoTrack, MediaTrack)
  29 NS_IMPL_RELEASE_INHERITED(VideoTrack, MediaTrack)
  30 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(VideoTrack)
  31 NS_INTERFACE_MAP_END_INHERITING(MediaTrack)
  32
  33 JSObject* VideoTrack::WrapObject(JSContext* aCx,
  34                                  JS::Handle<JSObject*> aGivenProto) {
  35   return VideoTrack_Binding::Wrap(aCx, this, aGivenProto);
  36 }
  37
  38 void VideoTrack::SetSelected(bool aSelected) {
  39   SetEnabledInternal(aSelected, MediaTrack::DEFAULT);
  40 }
  41
  42 void VideoTrack::SetEnabledInternal(bool aEnabled, int aFlags) {
  43   if (aEnabled == mSelected) {
  44     return;
  45   }
  46
  47   mSelected = aEnabled;
  48
  49   // If this VideoTrack is no longer in its original VideoTrackList, then
  50   // whether it is selected or not has no effect on its original list.
  51   if (!mList) {
  52     return;
  53   }
  54
  55   VideoTrackList& list = static_cast<VideoTrackList&>(*mList);
  56   if (mSelected) {
  57     uint32_t curIndex = 0;
  58
  59     // Unselect all video tracks except the current one.
  60     for (uint32_t i = 0; i < list.Length(); ++i) {
  61       if (list[i] == this) {
  62         curIndex = i;
  63         continue;
  64       }
  65
  66       VideoTrack* track = list[i];
  67       track->SetSelected(false);
  68     }
  69
  70     // Set the index of selected video track to the current's index.
  71     list.mSelectedIndex = curIndex;
  72
  73     HTMLMediaElement* element = mList->GetMediaElement();
  74     if (element) {
  75       element->NotifyMediaTrackEnabled(this);
  76     }
  77   } else {
  78     list.mSelectedIndex = -1;
  79
  80     HTMLMediaElement* element = mList->GetMediaElement();
  81     if (element) {
  82       element->NotifyMediaTrackDisabled(this);
  83     }
  84   }
  85
  86   // Fire the change event at selection changes on this video track, shall
  87   // propose a spec change later.
  88   if (!(aFlags & MediaTrack::FIRE_NO_EVENTS)) {
  89     list.CreateAndDispatchChangeEvent();
  90   }
  91 }
  92
  93 }  // namespace dom
  94 }  // namespace mozilla